// Copyright (c) 2004 by Arthur Langereis (arthur_ext at domain xfinitegames, tld com

// 1 op = 6 ANDs, 3 SHRs, 3 SHLs, 4 assigns, 2 ADDs
// O(1)

package {
    
function fast3bitlookup(b:uint):uint {
var c:uint, bi3b:uint = 0xE994; // 0b1110 1001 1001 0100; // 3 2 2 1  2 1 1 0
c  = 3 & (bi3b >> ((b << 1) & 14));
c += 3 & (bi3b >> ((b >> 2) & 14));
c += 3 & (bi3b >> ((b >> 5) & 6));
return c;

/*
lir4,0xE994; 9 instructions, no memory access, minimal register dependence, 6 shifts, 2 adds, 1 inline assign
rlwinmr5,r3,1,28,30
rlwinmr6,r3,30,28,30
rlwinmr7,r3,27,29,30
rlwnmr8,r4,r5,30,31
rlwnmr9,r4,r6,30,31
rlwnmr10,r4,r7,30,31
addr3,r8,r9
addr3,r3,r10
*/
}


function TimeFunc(func:Function):void {
var x:uint, y:uint, t:uint;
for(x=0; x<500; x++)
for(y=0; y<256; y++) func(y);
}

// main entry point for running testcase
function runTest():void{
TimeFunc(fast3bitlookup);
} //runTest()

// warm up run of testcase
runTest();
var startTime:uint = new Date().getTime();
runTest();
var time:uint = new Date().getTime() - startTime;
print("metric time " + time);

}